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mikejuk (1801200) writes "We all know the problem — stick with a slow moving lane or change to the other lane, which usually then slows down even more than the original lane. Now we have a definitive solution via a Monte Carlo Simulation.And you might not like the answer:It all depends on what everyone else is doing. If more than 50% are changing lanes then you don't win if you change lanes but you do if you're in the minority. This mirrors many of the results in game theory where a selfish strategy works well, but only if it is the minority strategy. Given most drivers stick in a lane then swapping is probably a good choice — unless this news gets out."Link to Original Source

Seems like there should be some penalty for changing and also a weight on the opportunity to do so. Presumably if nobody is changing lanes at all and everybody is proceeding at the same speed it's very hard to change lanes at all!